Subtract 21/9 from 7/80
1st number: 7/80, 2nd number: 2 3/9
7/80 - 21/9 is -539/240.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 9 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
7/80 = 7 × 9/80 × 9 = 63/720 - Likewise, for the 2nd fraction, since 9 × 80 = 720,
21/9 = 21 × 80/9 × 80 = 1680/720 - Subtract the two like fractions:
63/720 - 1680/720 = 63 - 1680/720 = -1617/720 - After reducing the fraction, the answer is -539/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/80-21/9 7/80-42/9 7/80-21/18 21/80-21/9 7/80-63/9 7/80-21/27 35/80-21/9 7/80-21/45 49/80-21/9 7/80-21/63